阅读说明：本技术 一种取向硅钢非对称平直度的控制方法及装置 (Method and device for controlling asymmetric flatness of oriented silicon steel ) 是由 李春元 王伦 周阳 王淑志 陈俊男 焦彦龙 任存杰 姬凤川 于 2019-09-12 设计创作，主要内容包括：本发明提供一种取向硅钢非对称平直度的控制方法,包括：控制取向硅钢板坯的入炉温度大于350℃,控制预加热温度为800～950℃,第一加热段的温度为1070～1090℃,第二加热段的温度为1130～1150℃,均热段的温度为1120～1130℃；炉压为25～35pa；控制粗轧模式为“0+5”轧制模式；确定第一精轧机架的及第二精轧机架的辊缝调平值,板坯镰刀弯的变化量小于5mm；控制板坯在第一精轧机架、第二精轧机架及第三精轧机架的穿带方向；在层冷过程中,控制层流辊道的速度大于带钢速度的14％,控制带钢的加速度为0.25m/s<Sup>2</Sup>,控制带钢的加速起点为带钢头部距离第七精轧机架出口的49～50m处。(The invention provides a method for controlling the asymmetric flatness of oriented silicon steel, which comprises the following steps: controlling the furnace feeding temperature of the oriented silicon steel plate blank to be more than 350 ℃, controlling the preheating temperature to be 800-950 ℃, controlling the temperature of the first heating section to be 1070-1090 ℃, controlling the temperature of the second heating section to be 1130-1150 ℃ and controlling the temperature of the soaking section to be 1120-1130 ℃; the furnace pressure is 25-35 pa; controlling the rough rolling mode to be a rolling mode of 0+ 5; determining roll gap leveling values of a first finish rolling machine frame and a second finish rolling machine frame, wherein the variation of the camber of the plate blank is less than 5 mm; controlling the strip threading directions of the plate blank in a first finish rolling machine frame, a second finish rolling machine frame and a third finish rolling machine frame; in the process of laminar cooling, the speed of the laminar flow roller way is controlled to be more than 14 percent of the speed of the strip steel, and the acceleration of the strip steel is controlled to be 0.25m/s 2 And controlling the acceleration starting point of the strip steel to be 49-50 m away from the outlet of the seventh finish rolling stand from the head of the strip steel.)

1. A method of controlling the asymmetric flatness of oriented silicon steel, the method comprising:

controlling the charging temperature of the oriented silicon steel plate blank to be more than 350 ℃;

in the heating stage, the preheating temperature of a heating furnace is controlled to be 800-950 ℃, the temperature of a first heating section of the heating furnace is controlled to be 1070-1090 ℃, the temperature of a second heating section of the heating furnace is controlled to be 1130-1150 ℃, and the temperature of a soaking section of the heating furnace is controlled to be 1120-1130 ℃; controlling the furnace pressure of the heating furnace to be 25-35 pa;

after the slab is taken out of the furnace, in the rough rolling process, controlling the rough rolling mode of the rough rolling frame to be a rolling mode of 0+ 5; the "0 + 5" rolling mode includes: zero pass rolling is carried out on the first rough rolling frame; rolling the second rough rolling frame for five times;

in the finish rolling process, determining a first roll gap leveling value of a first finish rolling stand and a second roll gap leveling value of a second finish rolling stand according to the camber variation and the head elongation of the plate blank in the rough rolling process, wherein the camber variation of the plate blank is less than 5 mm;

controlling the strip threading directions of the plate blank on a first finish rolling machine frame, a second finish rolling machine frame and a third finish rolling machine frame according to the variable quantity of the camber of the plate blank and the historical finish rolling strip threading direction;

in the process of laminar cooling, the speed of the laminar flow roller way is controlled to be higher than 14% of the speed of the strip steel, and the acceleration of the strip steel is controlled to be 0.25m/s²And controlling the acceleration starting point of the strip steel to be 49-50 m away from the outlet of the seventh finish rolling stand from the head of the strip steel.

2. The method of claim 1, wherein prior to the finish rolling process, the method further comprises:

and when the forward variation of the camber of the plate blank is larger than 40mm or the reverse variation of the camber of the plate blank is larger than 30mm, controlling the edge heater of the plate blank to be closed.

3. The method of claim 1, wherein determining a first roll gap leveling value for the first finishing mill stand based on the amount of change in the camber and the head elongation of the slab comprises:

determining the first roll gap leveling value according to the formula F1 ═ A × S/100; the device comprises a plate blank, a leveling coefficient, a base, a leveling mechanism and a leveling mechanism, wherein A is the camber variation of the plate blank, and S is the leveling coefficient.

4. The method of claim 1, wherein determining a second roll gap leveling value for the second finishing mill stand based on the amount of change in the camber and the head elongation of the slab comprises:

determining the second roll gap leveling value according to the formula F2 ═ a × 0.25/100; wherein A is the camber variation of the slab.

5. The method of claim 3, wherein S is determined from the elongation of the head of the slab.

6. An apparatus for controlling the asymmetric flatness of oriented silicon steel, the apparatus comprising:

the first control unit is used for controlling the furnace feeding temperature of the oriented silicon steel plate blank to be more than 350 ℃;

the second control unit is used for controlling the preheating temperature of the heating furnace to be 800-950 ℃, the temperature of the first heating section of the heating furnace to be 1070-1090 ℃, the temperature of the second heating section of the heating furnace to be 1130-1150 ℃ and the temperature of the soaking section of the heating furnace to be 1120-1130 ℃ in the heating stage; controlling the furnace pressure of the heating furnace to be 25-35 pa;

the third control unit is used for controlling the rough rolling mode of the rough rolling frame to be a rolling mode of 0+ 5' in the rough rolling process after the plate blank is discharged from the furnace; the "0 + 5" rolling mode includes: zero pass rolling is carried out on the first rough rolling frame; rolling the second rough rolling frame for five times;

the fourth control unit is used for determining a first roll gap leveling value of the first finish rolling stand and a second roll gap leveling value of the second finish rolling stand according to the camber variation and the head elongation of the plate blank in the rough rolling process; the variation of the camber of the plate blank is less than 5 mm;

the fifth control unit is used for controlling the strip threading directions of the plate blank on the first finish rolling machine frame, the second finish rolling machine frame and the third finish rolling machine frame according to the camber variation of the plate blank and the historical finish rolling strip threading directions;

a sixth control unit for controlling the speed of the laminar flow roller bed to be higher than the strip steel degree speed in the process of laminar coolingThe acceleration of the strip steel is controlled to be 0.25m/s at 14 percent of the degree²And controlling the acceleration starting point of the strip steel to be 49-50 m away from the outlet of the seventh finish rolling stand from the head of the strip steel.

7. The apparatus of claim 6, wherein the apparatus further comprises: and the seventh control unit is also used for controlling the edge heater of the plate blank to be closed when the forward variation of the camber of the plate blank is determined to be larger than 40mm or the reverse variation of the camber of the plate blank is determined to be larger than 30 mm.

8. The apparatus of claim 6, wherein the fourth control unit is specifically configured to:

determining the first roll gap leveling value according to the formula F1 ═ A × S/100; the device comprises a plate blank, a leveling coefficient, a base, a leveling mechanism and a leveling mechanism, wherein A is the camber variation of the plate blank, and S is the leveling coefficient.

9. The apparatus of claim 6, wherein the fourth control unit is specifically configured to:

determining the second roll gap leveling value according to the formula F2 ═ a × 0.25/100; wherein A is the camber variation of the slab.

10. The method of claim 8, wherein S is determined from the elongation of the head of the slab.

Technical Field

The invention relates to the technical field of hot rolling, in particular to a method and a device for controlling the asymmetric flatness of oriented silicon steel.

Background

With the development and progress of the silicon steel industry, the requirement on the thickness control precision of silicon steel raw materials is higher and higher. The larger the transverse thickness difference of the silicon steel is, the lower the lamination coefficient of the iron core is, and the reduction of the lamination coefficient by 1 percent is equivalent to the increase of the iron loss by 2 percent and the reduction of the magnetic induction by 1 percent. In the increasingly aggressive silicon steel market environment, the accuracy of the lateral thickness difference of the silicon steel sheet must be improved.

The transverse thickness difference is mainly determined by two parameters of wedge shape and convexity of the strip steel, and the wedge shape is mainly determined by asymmetric flatness. In actual production, because the asymmetric straightness of silicon steel can not be effectively controlled, the wedges on the two sides of the strip steel can not be effectively controlled, and further the control precision of the transverse thickness difference can not be ensured, so that the yield of the silicon steel is reduced, and the strip steel cutting loss rate of a downstream production line is increased.

Disclosure of Invention

Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for controlling the asymmetric flatness of oriented silicon steel, which are used for solving the technical problems that in the prior art, the control precision of the transverse thickness difference of a strip steel cannot be ensured due to the fact that the asymmetric flatness of the silicon steel cannot be effectively controlled, so that the yield of the silicon steel is reduced, and the strip steel cutting loss rate of a downstream production line is increased.

The embodiment of the invention provides a method for controlling the asymmetric flatness of oriented silicon steel, which comprises the following steps:

controlling the charging temperature of the oriented silicon steel plate blank to be more than 350 ℃;

in the heating stage, the preheating temperature of a heating furnace is controlled to be 800-950 ℃, the temperature of a first heating section of the heating furnace is controlled to be 1070-1090 ℃, the temperature of a second heating section of the heating furnace is controlled to be 1130-1150 ℃, and the temperature of a soaking section of the heating furnace is controlled to be 1120-1130 ℃; controlling the furnace pressure of the heating furnace to be 25-35 pa;

after the slab is taken out of the furnace, in the rough rolling process, controlling the rough rolling mode of the rough rolling frame to be a rolling mode of 0+ 5; the "0 + 5" rolling mode includes: zero pass rolling is carried out on the first rough rolling frame; rolling the second rough rolling frame for five times;

in the finish rolling process, determining a first roll gap leveling value of a first finish rolling stand and a second roll gap leveling value of a second finish rolling stand according to the camber variation and the head elongation of the plate blank in the rough rolling process, wherein the camber variation of the plate blank is less than 5 mm;

controlling the strip threading directions of the plate blank on a first finish rolling machine frame, a second finish rolling machine frame and a third finish rolling machine frame according to the variable quantity of the camber of the plate blank and the historical finish rolling strip threading direction;

in the process of laminar cooling, the speed of the laminar flow roller way is controlled to be higher than 14% of the speed of the strip steel, and the acceleration of the strip steel is controlled to be 0.25m/s²And controlling the acceleration starting point of the strip steel to be 49-50 m away from the outlet of the seventh finish rolling stand from the head of the strip steel.

In the above aspect, before the finish rolling process, the method further includes:

and when the forward variation of the camber of the plate blank is larger than 40mm or the reverse variation of the camber of the plate blank is larger than 30mm, controlling the edge heater of the plate blank to be closed.

In the above-mentioned scheme, the determining a first roll gap leveling value of the first finish rolling stand according to the variation of the camber of the slab and the head elongation includes:

determining the first roll gap leveling value according to the formula F1 ═ A × S/100; the device comprises a plate blank, a leveling coefficient, a base, a leveling mechanism and a leveling mechanism, wherein A is the camber variation of the plate blank, and S is the leveling coefficient.

In the above-mentioned scheme, the second roll gap leveling value of second finish rolling stand is confirmed according to the variation and the head elongation of the slab camber, include:

determining the second roll gap leveling value according to the formula F2 ═ a × 0.25/100; wherein A is the camber variation of the slab.

In the above scheme, the S is determined according to the elongation of the head of the slab.

The embodiment of the invention also provides a device for controlling the asymmetric flatness of the oriented silicon steel, which comprises:

the first control unit is used for controlling the furnace feeding temperature of the oriented silicon steel plate blank to be more than 350 ℃;

the second control unit is used for controlling the preheating temperature of the heating furnace to be 800-950 ℃, the temperature of the first heating section of the heating furnace to be 1070-1090 ℃, the temperature of the second heating section of the heating furnace to be 1130-1150 ℃ and the temperature of the soaking section of the heating furnace to be 1120-1130 ℃ in the heating stage; controlling the furnace pressure of the heating furnace to be 25-35 pa;

the third control unit is used for controlling the rough rolling mode of the rough rolling frame to be a rolling mode of 0+ 5' in the rough rolling process after the plate blank is discharged from the furnace; the "0 + 5" rolling mode includes: zero pass rolling is carried out on the first rough rolling frame; rolling the second rough rolling frame for five times;

the fourth control unit is used for determining a first roll gap leveling value of the first finish rolling stand and a second roll gap leveling value of the second finish rolling stand according to the camber variation and the head elongation of the plate blank in the rough rolling process; the variation of the camber of the plate blank is less than 5 mm;

the fifth control unit is used for controlling the strip threading directions of the plate blank on the first finish rolling machine frame, the second finish rolling machine frame and the third finish rolling machine frame according to the camber variation of the plate blank and the historical finish rolling strip threading directions;

a sixth control unit for controlling the speed of the laminar flow roller way to be more than 14% of the strip steel degree speed and controlling the acceleration of the strip steel to be 0.25m/s in the process of layer cooling²And controlling the acceleration starting point of the strip steel to be 49-50 m away from the outlet of the seventh finish rolling stand from the head of the strip steel.

In the above scheme, the apparatus further comprises: and the seventh control unit is also used for controlling the edge heater of the plate blank to be closed when the forward variation of the camber of the plate blank is determined to be larger than 40mm or the reverse variation of the camber of the plate blank is determined to be larger than 30 mm.

In the foregoing solution, the fourth control unit is specifically configured to:

determining the first roll gap leveling value according to the formula F1 ═ A × S/100; the device comprises a plate blank, a leveling coefficient, a base, a leveling mechanism and a leveling mechanism, wherein A is the camber variation of the plate blank, and S is the leveling coefficient.

In the foregoing solution, the fourth control unit is specifically configured to:

determining the second roll gap leveling value according to the formula F2 ═ a × 0.25/100; wherein A is the camber variation of the slab.

In the above scheme, the S is determined according to the elongation of the head of the slab.

The invention provides a method for controlling the asymmetric flatness of oriented silicon steel, which comprises the following steps: controlling the charging temperature of the oriented silicon steel plate blank to be more than 350 ℃; in the heating stage, the preheating temperature of the heating furnace is controlled to be 800-950 ℃, the temperature of a first heating section of the heating furnace is controlled to be 1070-1090 ℃, the temperature of a second heating section of the heating furnace is controlled to be 1130-1150 ℃, and the temperature of a soaking section of the heating furnace is controlled to be 1120-1130 ℃; controlling the furnace pressure of the heating furnace to be 25-35 pa; after the slab is taken out of the furnace, in the rough rolling process, controlling the rough rolling mode of the rough rolling frame to be a rolling mode of 0+ 5; the "0 + 5" rolling mode includes: zero pass rolling is carried out on the first rough rolling frame; rolling the second rough rolling frame for five times; in the finish rolling process, determining a first roll gap leveling value of a first finish rolling stand and a second roll gap leveling value of a second finish rolling stand according to the camber variation and the head elongation of the plate blank in the rough rolling process, wherein the camber variation of the plate blank is less than 5 mm; controlling the threading directions of the plate blank on a first finish rolling machine frame, a second finish rolling machine frame and a third finish rolling machine frame according to the camber variation of the plate blank and the historical finish rolling threading direction; in the process of laminar cooling, the speed of the laminar flow roller way is controlled to be higher than 14% of the speed of the strip steel, and the acceleration of the strip steel is controlled to be 0.25m/s²Controlling the acceleration starting point of the strip steel to be 49-50 m away from the outlet of the seventh finish rolling stand; therefore, the temperature difference of the plate blank is eliminated by controlling the furnace entering temperature and the temperature of each heating section, the temperature difference of two sides of the strip steel can be reduced by controlling the furnace pressure, and the rough rolling temperature drop is reduced by using a '0 + 5' rolling mode; after the temperature parameters are determined reasonably, in the finish rolling process, determining a first roll gap leveling value of the first rough rolling stand and a second roll gap leveling value of the second rough rolling stand according to the camber variation and the head elongation of the plate blank in the rough rolling process to improve the asymmetric flatness of the strip steel; the strip threading directions of the strip steel on the three frames before finish rolling are controlled according to the variable quantity of the camber of the plate blank and the historical finish rolling strip threading directions, so that the head parts of the strip steel of the three frames before finish rolling are slightly deviated, and the slightly deviated directions are consistent, thereby avoiding the unilateral wave shape of the strip steel when the strip steel is at a finish rolling outlet, and further ensuring that the asymmetric flatness of the strip steel is qualified; controlling according to the laminar flow parameters in the process of layer cooling, and avoiding the strip steel from being sleeved after a finish rolling outlet, thereby avoiding the locking of asymmetric flatness; by optimizing the temperature, leveling the roll gap, and comprehensively optimizing the finish rolling threading direction and the like, the blocking rate of the asymmetric flatness is reduced, and the control precision of the transverse thickness difference of the strip steel is ensured, so that the yield of silicon steel is improved, and the strip steel cutting loss rate of a downstream production line is also reduced.

Drawings

FIG. 1 is a schematic flow chart of a method for controlling the asymmetric flatness of oriented silicon steel according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a control device for controlling the asymmetric flatness of oriented silicon steel according to the second embodiment of the present invention.

Detailed Description

In order to solve the technical problems that in the prior art, the control precision of the transverse thickness difference of the strip steel cannot be ensured due to the fact that the asymmetric flatness of the silicon steel cannot be effectively controlled, the yield of the silicon steel is reduced, and the strip steel cutting loss rate of a downstream production line is increased, the invention provides a control method of the asymmetric flatness of the oriented silicon steel, which comprises the following steps: controlling the charging temperature of the oriented silicon steel plate blank to be more than 350 ℃; during the heating stage, controlThe preheating temperature of the heating furnace is 800-950 ℃, the temperature of a first heating section of the heating furnace is 1070-1090 ℃, the temperature of a second heating section of the heating furnace is 1130-1150 ℃, and the temperature of a soaking section of the heating furnace is 1120-1130 ℃; controlling the furnace pressure of the heating furnace to be 25-35 pa; after the slab is taken out of the furnace, in the rough rolling process, controlling the rough rolling mode of the rough rolling frame to be a rolling mode of 0+ 5; the "0 + 5" rolling mode includes: zero pass rolling is carried out on the first rough rolling frame; rolling the second rough rolling frame for five times; in the finish rolling process, determining a first roll gap leveling value of a first rough rolling stand and a second roll gap leveling value of a second rough rolling stand according to the camber variation and the head elongation of the plate blank in the rough rolling process, wherein the camber variation of the plate blank is less than 5 mm; controlling the threading directions of the plate blank on a first finish rolling machine frame, a second finish rolling machine frame and a third finish rolling machine frame according to the camber variation of the plate blank and the historical finish rolling threading direction; in the process of laminar cooling, the speed of the laminar flow roller way is controlled to be higher than 14% of the speed of the strip steel, and the acceleration of the strip steel is controlled to be 0.25m/s²And controlling the acceleration starting point of the strip steel to be 49-50 m away from the outlet of the seventh finish rolling stand from the head of the strip steel.

The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.